<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>输入输出语句</title>
</head>
<body>
    <script>
        //1.输入框
        //prompt("请输入");

        //2.弹出警告
        //alert("hello");

        //3.控制台输出
        //console.log("zx")

        //4.页面内容输出
        document.write("zx");
        document.write("<br>");
        document.write("18");

    </script>
</body>
</html>